DatabaseClient::DatabaseClient(
    const char* hostname,
    const char* username,
    const char* password,
    const uint16_t port
)
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7)
    : DatabaseClient(hostname, username, password, nullptr, port)
{
}
#else
    : connection_(mysql_init(nullptr))
{
    if (nullptr == connection_) {
        throw MySqlException("Unable to connect to MySQL");
    }

    const MYSQL* const success = mysql_real_connect(
        connection_,
        hostname,
        username,
        password,
        nullptr,
        port,
        nullptr,
        0);
    if (nullptr == success) {
        MySqlException mse(connection_);
        mysql_close(connection_);
        throw mse;
    }
}
#endif